* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

.billboards{
  position: relative;
  height: 46vw;
}
.billboards img{
  position: absolute;
  width: 100%;
  height: 100%;
}
.billboards .world{
  position: absolute;
  margin: 0 36vw;
}
.billboards .world .p1{
  text-align: center;
  margin-top: 12vw;
  font-size: 7vw;
  color: #fff;
}
.billboards .world .p2{
  margin-top: 2vw;
  text-align: center;
  font-size: 3vw;
  color: #fff;
}
.billboards .world .p3{
  margin-top: 3vw;
  width: 29vw;
  height: 3vw;
  font-size: 1vw;
  color: #fff;
  line-height: 2vw;
  text-align: center;
  font-weight: lighter;
}
.billboards .world div{
  display: flex;
  width: 16vw;
  height:5vw;
  margin: 3vw auto;
  background-color:white;
  align-items: center;
  justify-content: center;
}
.billboards .world div a{
  text-align: center;
  color: #fecf3b;
  font-size: 3vw;
}
.billboards .mask{
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
}
.billboards .mask{
  display: block;
}
